linux-kernel - Re: [PATCH v4] security: Yama LSM

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Message-ID: <20100630004911.GI4837@outflux.net>
Date:	Tue, 29 Jun 2010 17:49:12 -0700
From:	Kees Cook <kees.cook@...onical.com>
To:	James Morris <jmorris@...ei.org>
Cc:	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v4] security: Yama LSM

Hi,

On Wed, Jun 30, 2010 at 09:18:32AM +1000, James Morris wrote:
> On Mon, 28 Jun 2010, Kees Cook wrote:
> 
> > This adds the Yama Linux Security Module to collect several security
> > features (symlink, hardlink, and PTRACE restrictions) that have existed
> > in various forms over the years and have been carried outside the mainline
> > kernel by other Linux distributions like Openwall and grsecurity.
> > 
> > Signed-off-by: Kees Cook <kees.cook@...onical.com>
> 
> There were no further complaints, and we seem to have reached a workable 
> consensus on the topic.
> 
> It's not clear yet whether existing LSMs will modify their base policies 
> to incorporate these protections, utilize the Yama code more directly, or 
> implement some combination of both.

I'm hoping we can implement really simple chaining -- nothing fancy.
Trying to chain comprehensive LSMs seems like it will always fail, but
putting little LSMs in front of big LSMs seems like an easy win.

> If you're a user of an existing LSM and want these protections, bug the 
> developers for a solution :-)
> 
> Applied to
> git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6#next

Thanks!

-Kees

-- 
Kees Cook
Ubuntu Security Team
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